Classification[edit]
Acne is commonly classified by severity as mild, moderate, or severe. This type of categorization can be an important factor in determining the appropriate treatment regimen.[12] Mild acne is classically defined as open (blackheads) and closed comedones (whiteheads) limited to the face with occasional inflammatory lesions.[12] Acne may be considered to be of moderate severity when a higher number of inflammatory papules and pustules occur on the face compared to mild cases of acne and acne lesions also occur on the trunk of the body.[12] Lastly, severe acne is said to occur when nodules and cysts are the characteristic facial lesions and involvement of the trunk is extensive.[12]